Static eliminator tube



May 3, 1932. E. TEEL I STATIC ELIMINATOR TUBE Filed Jan. 6. 1930 m n WFar! 728 2 to the tops of large posts 34 and 35.

Patented May 3, 1932 UNITED STATES PATENT OFFICE EARL TEEL, OF NORMAN,OKLAHOMA, ASSIGNOR OF ONE-HALF T F. B. BWANK, 0F NORMAN, OKLAHOMA STATICELIMINATOR TUBE Application filed January 6, 1930. Serial No. 418,915.

This invention relates to radio tubes and the object is to provide atube which will reduce or eliminate static.

Referring to the accompanying drawings, which are made a part hereof andon which similar reference characters indicate similar parts,

Figure 1 is and Figure 2 is a conventional diagrammatic viiw showing thefilament and the coils in the tu e.

In the drawings numeral indicates a cap of suitable insulating materialforming a top for the tube and in which a glass bulb or envelope 11 issuitably sealed and numeral 12 indicates a base for the glass bulb, thisbase being of suitable insulating material likea view in elevation ofthe tube,

Wise and being somewhat larger than the cap 2o 10. The cap 10 hasbinding posts 13 and 14. The binding post 14 will have connected to itthe outside antenna of the radio and to the binding post 13 is attachedan antenna which leads to the antenna post on a radio 5 set. Fiber posts15 and 16 are mounted upon osts 17 and 18 which are mounted in a glassase support 19. Similar fiber posts 20 and 21 are mounted upon brackets22 and 23. A wire 24 is connected to the binding post-14 and to a finewire 25 which is wound around the posts 15 and 16 to provide a number ofturns and is secured atits lower end to a wire 26 which passes downthrough the base 12 of the plug and is secured at its lower 1 end to apost 27 A wire 28 is connected to the binding post 13 within the tubeand is attached to a fine wire 37 which is wound around fiber posts 20and 21 and is secured at its end to a wire 29 which in turn is securedat its lower end to a post 30. Posts27 and 30 are small posts which aremade to fit corresponding sockets on the radio. A filament 31 isattached at its lower ends towires 32 and 33 which are secured at theirlower erijlfis e filament 31 may be looped over a hook 36 secured to theunder side of the cap 10. The filament 31 may be heated by any .smtablecurrent in the usual way.

The filament 31 may be any suitable mateondary, increasing as .By thismethod the electrical impulses coming rial, preferably tungsten with acoating of barium, strontium, or thorium oxide and. should be made indifferent voltages and amperages so that it may be adapted to all makes0? radios.

The theory of operation of my invention is as follows: It is nowgenerall accepted that all substances are made 0 electrons whichthemsleves are negative particles of electricity. In a piece of metal,for example,

these negative particles move about in 21gzag paths in all directions atvery high velocities. The velocity, however, is dependent on thetemperature of the metal, increasing with an increase of temperature. Ifthe metal is heated very hot the electrons attain enormously highvelocities sufiicient to fly oif from the surface in a manner somewhatanalogous to the escape of steam from the surface of water when it isboiled. The heated filament of a vacuum tube, of course, becomes asource of electrons. The plate of the tube is charged with positiveelectricity. Unlike charges of electricity attract each other so thepositive charges cause the negative electrons to flow to the positive onthe plate. The electrical impulses that are coming in are those put outby the broadcasting station and energize the primary coil of the tube.The primary coil is connected to the aerial and is grounded to theoutside. The secondary coil of the tube is connected at one end to theaerial of the radio and at the other to the ground posts of theradioset. The secondary coil of the tube has no charge of electricity. Whenthe filament of the tube is heated the negative electrons are permitttedto pass to the positive charge thus making a flow of current from theprimary to the secthe filament is heated.

in from the broadcasting station are inductively transmitted from theprimary to the secondary windings with practically no loss whatever, andpass into the receiver to be transformed into sound. Now the outsideaerial is in some respects a condenser, i. e., it allows staticelectricity to collect and when loaded to capacity it discharges insurges into the ground. The longer the aerial the greater the capacityand the greater the surges. The only other way this passage is made isthrough the receivin set. These surges are detected and ampli ed as arethe impulses from the broadcasting station and are brought out in theloud speaker in the form of objectionable noises which are termedstatic, but by using the primary winding of the tube as conductor fromthe aerial and grounding it to the outside the static discharges thataccumulate on the aerial will follow the line of least resistance to theground, that line being direct through the primary winding of the coil.As the signals from the broadcasting station are received and brought inby the aerial to the primary winding of the coil the negative electronsflowing from the filament of the tube to the primary coil are a mediumby which the impulses of the broadcasting station are brought over andcaused to flow at a constant rate into the secondary coil and into thereceiving set. As the static surges discharge they pass at such a highvelocity that it is easy for them to reach the ground by the directconnection of the primary coil, they hence do not affect the incomingsignal. v

It will be obvious to those skilled in the art that various changes maybe made in my device without departing from the spirit of the inventionand therefore I do not limit myself to what is shown in the drawings anddescribed in the specification but only as indicated in the appendedclaim.

Having thus fully described my said invention, what I claim as new anddesire to secure by Letters Patent, is:

An electric discharge tube comprising an envelope terminating in are-entrant support at one end thereof, electrodes mounted on saidsupport in said envelope and having leads passing through said support,a base having terminals fixed to said envelope adjacent said support, acap having terminals fixed to the opposite endof said envelope, each oftwo of said electrodes constituting a wound coil inductively coupled tothe other, another of said electrodes constituting a filamentary cathodehaving leads connected to the terminals of said base, one end of each ofsaid wound electrodes being connected to a terminal in said base and theother end of each of said wound electrodes being connected to a terminalin said cap. v

In witness whereof, I have hereunto set my hand at Norman, Oklahoma,this second day of January, A. D. nineteen hundred and thirty.

EARL TEEL.

